How do I do the Update raw query in Doctrine?

I need to update extra field in associative table w开发者_如何学Cith a raw query how do I do it. Nothing is working !!!!!

This works for me with Doctrine 1.2 when doing an UPDATE:

Doctrine_Manager::getInstance()
  ->getCurrentConnection()
  ->execute("UPDATE table t SET t.field = 1 WHERE t.id = 2");